Hi,
If you read the description of the planet Agusia (page 349) you might come to the conclusion that it might be a Necron Tomb World.
Yet what Tech-Priests have discovered is both wondrous and puzzeling: ornate sloping tomb-fanes, huge dormant prayer-mechanisms of a dozen varieties, mausoleums efficiently filled with stacked biers, walls of black-green metal set with intricate silver magnetic runes, ornate hololithic displays of abstract art somehow still active after millennia.
It does remind me of Necrons...